Rings of Brighthearth, Deserted Temple, and Nykthos, Shrine to Nyx

Prerequisites

• Rings of Brighthearth on the battlefield
• Deserted Temple on the battlefield
• Nykthos, Shrine to Nyx on the battlefield
• available

Steps

1. Activate Nykthos, Shrine to Nyx by paying and tapping it, adding at least Activate Deserted Temple's second ability by paying and tapping it, targeting Nykthos, Shrine to Nyx
2. Rings of Brighthearth triggers, causing you to pay to copy Deserted Temple's ability, targeting Deserted Temple
3. Resolve both Deserted Temple abilities, untapping Deserted Temple and Nykthos, Shrine to Nyx Repeat

Results

• Infinite mana lands you control can produce
• Infinite untap of lands you control